The Witty USB Charger Adapter is an essential accessory for anyone who’s on the go all day long. Because this little gadget can actually double your smartphone’s battery life. Compatible with Apple and Android phones—as well as any other USB-A device—this could save your phone battery. The great part is that it measures just three centimeters wide and tall, so it’s easy to take with you in your pocket or bag. In fact, it’s actually eco-friendly, too, because it makes your smartphone battery last longer. So you won’t have to buy a replacement and send the old one to the landfill. Totally self-powered, the LEDs on the side conveniently display as full when the device is all ready to go.